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SRC-131 Hotel Controller Manual
12
5.15
Remote Temperature sensors
Occasionally the room controller cannot be installed in the ideal location to measure the room temperature
accurately. In these circumstances the SRC-131 can use optional
remote temperature sensors. These are
a two wire device, not polarity dependent and simply wired into the SRC-131 sensor inputs terminals.
Depending on installer menu sensor settings, shown on page 11, remote sensor(s) will either override the
SRC-131 onboard sensor or average with the onboard sensor. Multiple sensors can be used for averaging
over larger areas if necessary. Wireless (RF) remote sensors are also available if wiring cannot be installed
economically.
5.16
Modbus Wiring
Modbus communications unlock many additional functions within the SRC-131 controller. It also permits
all modes, functions and controls to be remotely supervised and adjusted from a central location if
needed. Modbus object data can be found later on this manual.
The SRC-131 uses a high powered Maxim chipset that will “theoretically” permit the connection of up to 255
devices on a single Modbus node. RF noises and other interferences will reduce the real world permitted
connections to a maximum of 200 in most cases.
Modbus and other communication protocol rely on the quality of cable and good installation practises
to ensure reliable communications. Modbus requires the use of screen cable with the drain grounded in a
single location.
Hint! When the SRC-131 is connected to a working Modbus Network and receiving valid data, the
decimal point in the temperature display will blink. If there is no communication or the SRC-131 is
receiving corrupted data, this decimal point will remain on steady.
Modbus relies on a series connection and will normally not tolerate “Star” wiring or “T” branches.
